1011166605 has 64 divisors (see below), whose sum is σ = 1898496000. Its totient is φ = 509219136.

The previous prime is 1011166591. The next prime is 1011166609. The reversal of 1011166605 is 5066611101.

1011166605 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 1011166605 - 2⁴ = 1011166589 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1011166609) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1228224 + ... + 1229046.

It is an arithmetic number, because the mean of its divisors is an integer number (29664000).

Almost surely, 2^1011166605 is an apocalyptic number.

1011166605 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1011166605 is a deficient number, since it is larger than the sum of its proper divisors (887329395).

1011166605 is a wasteful number, since it uses less digits than its factorization.

1011166605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1335 (or 1329 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 27.

The square root of 1011166605 is about 31798.8459696260. The cubic root of 1011166605 is about 1003.7084321973.

Adding to 1011166605 its reverse (5066611101), we get a palindrome (6077777706).

The spelling of 1011166605 in words is "one billion, eleven million, one hundred sixty-six thousand, six hundred five".